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rADio twiCE

B. broadcast broadcast 这个动词,过去式和过去分词加不加-ed 都可以。 选 B 是取其过去分词的形式,被动语态表达 “... 在收音机中【被播放】了两次”

TV sets and radios add up to 90 or J00 decibels, a certain unit used ... and an ordinary train, reaching the station, can be twice as loud as ...

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